The phrase "actually seldom" is correct and usable in written English.
It can be used to emphasize the rarity of an occurrence, often in contrast to a previous assumption or statement.
Example: "While many believe he travels frequently, he actually seldom leaves his hometown."
Alternatives: "in fact rarely" or "truly infrequently".
Suspicion of infection led to replacement of many catheters (n = 40, 32%) but was actually seldom proven (n = 4, 3%).
Financial matters are something that we should discuss openly, but in fact we actually seldom do.
In fact it is likely that development of techniques to operate on the liver in situ that the ante-situm approach is actually seldom if ever required (Oldhafer et al, 2001).
Actually, this seldom happens.
In unlimited polytheism, the number of gods that are actually worshipped seldom exceeds a few hundred within one religion, but in theory, as in India, millions and millions of gods may be thought to exist.
But Sengupta says this often yields few results: "In theory, yes, the administration is supposed to try to stop the practice, but actually that seldom happens," he tells me.
But we seldom actually order from catalogs because we know that pictures can, if not lie exactly, then pleasantly distort.
"Food comes up very seldom, actually," Mr. Roberts said when I asked whether his readers thought much about wine and food together.
When Nixon won, when Reagan won, when Bush Jr. won, people vowed to leave the country, though they seldom actually did it.
Central to the movie's look, and feel, were those tommy guns, which the squad carried, but seldom actually used, in real life.
So far as I know, this is very seldom actually illegal, but there is a very strong cultural taboo against eating wild fish - which means, in Britain, almost anything but trout.
